SOJEF: A century ago, a group of our young people wanted to follow the ways of the offlanders. They tried to take over the colony and when they failed...
RU'AFO: And when we failed, you exiled us to die slowly.

Of course this doesn't make much sense once you think about it. A bunch of young people have technology (from where?) that enables them to leave the planet but they are unable to take power from their parents who live in a pre-industrial economy? The background is, as usual, not well-flashed out as, hardly a surprise either, the story is focused upon other stuff.

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The illegal we do immediately; the unconstitutional takes a little longer. - former US Secretary of State and unconvicted war criminal Henry Kissinger